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Check the concentration of CO2 in the interior with the simple reference design, Sensirion SCD4x CO2 Gadget. After measuring the increased CO2 concentration, a light signal on the product will alert you that it is time to ventilate.
You can keep the concentration of formaldehyde at a safe level by frequent ventilation. But how to ventilate effectively? With the SFA30 Sensirion, it's a piece of cake.
The total volatile organic compounds concentration in ppb cannot be measured by using a single MOS sensor, but the VOC index can. Try it out with the SGP40 sensor in the SEK-SVM40 Sensirion development kit. We have it in our stock.